Combined soil foundation analysis based on ultimate limit state Maxim Matvienko 1* , Vladimir Dyba 1 , and Julia Matvienko 1 1 Platov South Russian State Polytechnic University (NPI), 346428 Novocherkassk, Russia Abstract. The paper defines an updated method for “soil – reinforced concrete foundation” calculation that takes into account their mutual interaction. In this method, both the foundation structure and the footing structure are represented by a rigid-plastic model, which makes it possible to determine the bearing capacity of the system. This method eliminates the possibility of destruction of the reinforced concrete foundation from punching to the exhaustion of its bearing capacity. It further presents the results of the test conducted by the authors at Novocherkassk School for Soil Mechanics Research to validate the theoretical calculations attained with the use of the proposed method, as well as the results of tray testing of reinforced concrete foundation models. The calculation of the bearing capacity by the modernized method gives values close to the results of experimental studies. The authors discuss the challenge of determining the strength of sand base, which is known to affect the calculation of load-bearing capacity, and further propose a solution that uses piecewise linear limit line of shear strength of soil and has been developed in an attempt to increase the accuracy of calculations. 1 Introduction In the Russian Federation, the method for calculating the load-bearing capacity of “reinforced concrete foundation – soil” system involves two independent calculations, but the fact remains: under load, there occurs an interaction between the foundation and the ground base. Pursuant to the current Construction Regulation 22.13330.2016 “Foundations of Buildings and Structures”, soil basement analysis should follow the formula (1), which relies on ultimate limit state and is based on Ludwig Prandtl ultimate load formula, later supplemented by K. Terzaghi. = ′ ⋅ ′ ⋅ ( ⋅ ⋅ ′ ⋅ + ⋅ ⋅ ′ ⋅+ ⋅ ⋅ ) (1) At the same time, the above formula is valid only for rigid foundations and, in fact, is not used in computational practice, since the maximum load values obtained with its use appear to exceed the experimental ones by 2 to 4 times. In fact, any calculation of centrally loaded foundation is performed with account of condition that the pressure under the foundation base does not exceed the calculated soil resistance R, and it is assumed that the contact stress * Corresponding author: [email protected] E3S Web of Conferences 371, 02023 (2023) https://doi.org/10.1051/e3sconf/202337102023 AFE-2022 © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
Combined soil foundation analysis based on ultimate limit state
Jun 28, 2023
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